Flask



FIG. 1 is a front elevational view of a flask;

FIG. 2 is a perspective view of the top, front and left side thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear elevational view thereof. 

The ornamental design for a flask, as shown. 